Electric switch.



.A. H NERO.

ELECTRIC SWITCH.

APPLICATION FILED OUT. 7. 1911.

1 ,JO%5,733, Patented Nov. 26, 1912.

W MM 24%? 2-6 I n I @vmwfomfigs ARVID H. NERO, OF NEW BRITAIN, CONNEG 0FHARTFORD, CONNECTIC cor/many,

TICUT, ASSIGNOR TO THE AJ RROW ELECTRIC UT, A CORPORATION-OFCONNECTICUT.

ELECTRIC SWITCH.

To all whom it may concern:

Be it known that I, Anvil) H. NERO, a citizen of the United States ofAmerica, and residing at Xew Britain, in the county I Specification ofLetters Patent. Application filed October 7, 1911. Serial No. 653,378'.

of Hartford and State of Connecticut, have invented a certain new andImproved Electric Switch, specification.

My invention relates to electric switches and particularly to electriclamp sockets, the object of my invention being to provide an improvedswitch device embodying the novel features hereafter described and[illustrated by way of example in the accompanying drawing in which,

of which the following is a Flgure l is a side elevation of a lampsocket; Fig; 2 is a partial vertical section therethrough; Fig. 3 is aperspective of the socket body with certain portions detached; and Fig.4 is a section on the line 4 4. Fig. 3 through the insulating strip.

Although readily embodied in various other constructions, I have forconvenience, illustrated. my invention in connection with a lamp socketof the type shown in Peterson 985,629. This socket ing two button basecomprises an insulat- A upon which are -mounted the lamp receiving shell5 and center contact 6. The latter is constantly in circuit through theline wire terminal plate 7, while theshell is in or out of upon theposition of the switch blocks 8, to which the current is led througl'ithe switch spring 9. on position the switch block is turned at rightangles to the position shown and lifts the spring conductor 10 intoengagement with the shell thus establishing the shell circuit. 7

In the patent above mentioned, the conduc- In the tor 10 is electricallyconnected with the shell 5 both by securing screw 11 which passesthrough both. In the present construction I insulate 3 this spirngconductor 10 from the shell 5 by interposing a strip 1:2 of insulatingmaterial between their juxtaposed surfaces. To insure its insulationalso from the securing screw 11, the perforation 13 of the conductor ismade of considerable greater width than the diameter of the screw 11 sothat the two do not come into contact. A simple way of insuring thisseparation of actual contact and through the Patentetl itovrzfi.1912.-

the conductor 10 from the screw 11 is illustrated. viz, by forcing thematerial of the insulating strip 12 down to form a collar 16 around thebolt hole 15. lVhen the strip 12 is in position on the spring conductor10, the collar 16 forms an insulating lining for the hole 13 therein andthus spaces and insulates. the screw 11 therefrom. By this simpleexpedient it will be observed that I have obtained a spring conductingpiece interposed between the switch block and the screw shell which inthe oif position is out of contact with and insulated from both. Thuswhen the switch is turned to the or position I secure two breakssubstantially simultaneous and in series in the shell circuit, that is,between the shell and the spring conductor on the one hand and betweenthe latter and the( switch block on the other hand. This so diminishessparking that the switch may be used with safety although carryingsubstantially twice the usual current permitted by the underwritersrules.

The advantage from the standpoint of safety is readily recognized aswell as its adaptability to various switch constructions.

I claim as my invention 1. An electric lamp socket comprising a switchblock constantly in the line of circuit, a lamp terminal in the switchcircuit and an interposed conductor insulated from both switch block andlamp terminal in the ofi" position of the switch but engaged anddisplaced-by said switch block into contact with said lamp terminal toclose the switch.

2. An electric lamp socket comprising a switch block; a lamp terminaland an interposed switch member through which connection is establishedbetween saidblock and lamp terminal in the on position of the switch,said switch member being insulated from both lamp and switch block inthe oif position of the switch.

3. An electric lamp socket comprising a switch block. a lamp terminaland an interposed spring conductor through which the spring conductorinterposed between block and shell terminal and displaceable by saidblock into contact with said shell to com;

plete the shell circuit, in combination Withswitch In testimony whereofI have signed my name to this specification, in the presence of twosubscribing witnesses.

ARVID H. NERO.

Witnesses:

BENJ. PERKINS, HELEN M. SAUNDERS.

